and on the Bituminous Rock of ' Ross-shire, Sec. 93 



trances of the Glens Urquhart and Morison, beautifully and 

 curiously intermixed with strata of gneiss. Nearer the lower 

 end of the lake, the quartz, as already observed, seems to pass 

 into a small-grained granite, and, along the whole line, all the 

 different kinds of rock are intersected by numerous beds and 

 veins of crystallized hornblende, and large-sized granite. * 



In the upper part of Glen-Morison, I have met with a yel- 

 lowish porphyrinic granite, containing crystals of felspar up- 

 wards of half an inch square, and forming one of the most 

 beautiful rocks in this country ; while, near Inverness, I have 

 noticed a chain of hills falling into Loch-Beauly, at a farm 

 called Phopachy, composed of a fine distinct red graphic gra- 

 nite. 



The quartz rock is not characterized by any suites of sim- 

 ple minerals ; the only included substance which I have no- 

 ticed being limestone, and that chiefly in small beds, near the 

 house of Foyers. 



In Glen-Urquhart limestone is rather abundant ; but it is 

 there contained in gneiss, and is rendered, in a great measure, 

 unserviceable for agricultural purposes, by the quantity of 

 asbestus, asbestous actynolite, and tremolite, which it con- 

 tains. 



Bronzite is said to occur in the same quarter, but I have 

 not been so fortunate as to fall in with it. I have, however, 

 noticed large detached specimens of this substance on the 

 banks of Loch-Arkeg. 



In Plate I. Figs. 10 and 11, is given a sketch of the north 

 and south sides of Lochness. 



Art. XVII. — Description of the Bituminous Rock which oc- 

 curs in Ross-shire, and the neighbourhood of Inverness, Sfc. 

 By Gkorgh Anderson, Esq. F. R. S. E., &c. Communi- 

 cated by the Author. 



In the last Number of the Edinburgh Journal of Science, I 

 remarked, that the predominant varieties of the sandstone, 



" Quartz rock occurs also in many other districts of this anil the neigh* 

 l>ouring counties, but it would be out of place to trace ull itfl boundaries in 

 the present paper. 



